EP0288075A2 - Zusatz-Boosterschaltung zum Anheben der Ausgangsspannung einer Haupt-Boosterspannung - Google Patents

Zusatz-Boosterschaltung zum Anheben der Ausgangsspannung einer Haupt-Boosterspannung Download PDF

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Publication number
EP0288075A2
EP0288075A2 EP88106492A EP88106492A EP0288075A2 EP 0288075 A2 EP0288075 A2 EP 0288075A2 EP 88106492 A EP88106492 A EP 88106492A EP 88106492 A EP88106492 A EP 88106492A EP 0288075 A2 EP0288075 A2 EP 0288075A2
Authority
EP
European Patent Office
Prior art keywords
mos transistor
booster circuit
circuit
sub
input terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88106492A
Other languages
English (en)
French (fr)
Other versions
EP0288075B1 (de
EP0288075A3 (en
Inventor
Hideo C/O Patent Division Kato
Hiroshi C/O Patent Division Iwahashi
Masamichi C/O Patent Division Asano
Akira Narita
Shinichi Kikuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Electronic Device Solutions Corp
Original Assignee
Toshiba Corp
Toshiba Microelectronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Microelectronics Corp filed Critical Toshiba Corp
Publication of EP0288075A2 publication Critical patent/EP0288075A2/de
Publication of EP0288075A3 publication Critical patent/EP0288075A3/en
Application granted granted Critical
Publication of EP0288075B1 publication Critical patent/EP0288075B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
    • G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
    • G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C5/00—Details of stores covered by group G11C11/00
    • G11C5/14—Power supply arrangements, e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels
    • G11C5/145—Applications of charge pumps; Boosted voltage circuits; Clamp circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/30—Power supply circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/06—Modifications for ensuring a fully conducting state
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/356—Bistable circuits
    • H03K3/356008—Bistable circuits ensuring a predetermined initial state when the supply voltage has been applied; storing the actual state when the supply voltage fails

Definitions

  • This invention relates to a M0S semiconductor integrated circuit, and more particularly to a sub-­booster circuit for raising an output voltage of a main booster circuit which generates a voltage higher than a power source voltage.
  • EPROM floating gate type nonvolatile semiconductor memories
  • EEPROM erasable programmable read-only memory
  • This type of semiconductor memory includes, for example, a memory which utilizes the Fowler-Nordheim tunneling effect. In the memory utilizing the tunneling effect, electrons are injected into or discharged from the floating gate via the thin oxide film in the data write-in or erasing operation. In the data write-in or erasing operation, there is little current consumption.
  • the data write-in or erasing operation can be effected by using an output voltage of a booster circuit provided in the memory instead of externally applying a high voltage required for the data write-in or erasing operation.
  • the booster circuit has a low current supplying ability, it can be used without any serious problem.
  • the circuit scale of the nonvolatile memory becomes large and the number of peripheral circuits (load circuits) to be supplied with a stepped-­up voltage increases. Therefore, the load capacitance of the booster circuit increases, thereby making it nec­essary to take a long step-up time for raising an output voltage to a desired level.
  • the load circuits to be supplied with an output voltage of the booster circuit are divided into a plurality of blocks and transfer gates are connected to input terminals of the respective blocks. The transfer gates are selectively activated by a control signal for selecting one of the blocks. An output voltage of the booster circuit is supplied to the load circuit block via the selected transfer gate.
  • the load capaci­tance of the booster circuit is lowered, preventing the voltage step-up time from being increased.
  • the output voltage of the sub-­booster circuit is supplied to the transfer gates to selectively activate the transfer gate. Since the transfer gate is selectively activated by a high voltage (equal to or higher than the sum of an output voltage of the main booster circuit and the threshold voltage of the transfer gate) of the sub-booster circuit, a voltage supplied from the booster circuit to the load circuit block will not be lowered by the threshold voltage of the transfer gate. Therefore, the output voltage of the booster circuit is efficiently supplied to the selected load circuit block.
  • the load capacitance of the main booster circuit can be lowered, thereby permitting a stepped-up voltage to be supplied to the load circuit in a brief time without lowering the output voltage of the main booster circuit.
  • a high voltage used for writing or erasing data in a semiconductor memory can be generated in the semicon­ductor integrated circuit (such as a nonvolatile semi­conductor memory).
  • a MOS transistor is used in the input stage of the load circuit, and a stepped-up voltage is applied to the gate of the MOS transistor. Therefore, a voltage supplied to the internal circuit of the load circuit is lowered by the threshold voltage of the input stage MOS transistor. For this reason, it is preferable to further raise an output voltage of the main booster circuit by means of the sub-booster circuit and supply it to the gate of the input stage MOS transistor even when the load circuits are not divided into a plurality of blocks.
  • the voltage step-up efficiency of the sub-booster cir­cuit which is commonly used is not sufficiently high to further raise the output voltage of the main booster circuit, and therefore it is strongly required to deve­lop the sub-booster circuit.
  • An object of this invention is to provide a sub-­booster circuit capable of raising an output voltage of a main booster circuit at a high efficiency.
  • a sub-booster cir­cuit comprising a first switching circuit which is connected at one end to receive an output voltage of a main booster circuit and has a control input terminal connected to an input terminal of an object circuit to be supplied with a stepped-up voltage; a second switch­ing circuit having one end and a control terminal con­nected to the other end of the first switching circuit and the other end connected to the input terminal of the object circuit, a potential for turning on the second switching circuit being larger in its absolute value than a potential for turning on the first switching cir­cuit; and a capacitance circuit having a first electrode connected to a connection node between the first and second switching circuits and a second electrode con­nected to receive a clock pulse signal, the capacitance circuit functioning as a capacitor when a potential at the first electrode is substantially equal to or higher than the potential for turning on the second switching circuit and exhibiting no capacitance property when the potential at the first electrode is lower than the potential for turning on the second switching circuit.
  • ON-resistances of the first and second switching circuits can be set to a small value and the second switching circuit can be kept in the off condition when the clock pulse falls.
  • a sub-booster circuit is provided in which reduc­tion in the output voltage caused by the presence of the first and second switching circuits may be suppress­ed to a minimum and which is operated to raise a voltage at a high step-up efficiency and high reliability.
  • Fig. 1 shows a sub-booster circuit according to one embodiment of this invention and the peripheral circuits thereof.
  • Power source voltage Vcc (or externally supplied high voltage Vpp) is stepped up or boosted by means of main booster circuit 11.
  • Stepped-up voltage Vpu which is obtained by raising power source voltage Vcc or high voltage Vpp by using main booster circuit 11 is supplied to sub-booster circuit 12 and object circuit 13 which is operated by the stepped-up voltage.
  • Sub-­booster circuit 12 includes N-channel MOS transistors Q1 and Q2 and MOS capacitor C1.
  • the drain of MOS transis­tor Q1 is connected to the output terminal of main booster circuit 11, and the gate thereof is connected to the output terminal (node N1) of selection circuit 14.
  • the input terminal of selection circuit 14 is con­nected to receive selection signals SS1 to SSn for selecting sub-booster circuit 12. Further, the output terminal of selection circuit 14 is connected to the input terminal of object circuit 13.
  • the source of MOS transistor Q1 is connected to the drain and gate of MOS transistor Q2 and the source of MOS transistor Q2 is connected to node N1.
  • a connection node (node N2) be­tween the source of MOS transistor Q1 and the drain of MOS transistor Q2 is connected to a first electrode of MOS capacitor C1.
  • a second electrode of MOS capacitor C1 is connected to the output terminal of clock genera­tion circuit 15 so as to receive clock pulse ⁇ c.
  • Object circuit 13 includes N-channel MOS transistor Q3.
  • the drain of MOS transistor Q3 is connected to the output terminal of main booster circuit 11 and the gate thereof is connected to node N1. Further, the source of MOS transistor Q3 is connected to an internal circuit which is not shown.
  • a parasitic capacitor such as a wiring capacitor and a gate capacitor is denoted by capacitor C2 which is grounded at one electrode.
  • V1b denotes a potential at node N1 after the rise potential has been reached.
  • potential V1a at node N1 rises by "(V ⁇ - V TH1 - VTH2 ) ⁇ C1/(C1 + C2)".
  • V GS2 denotes a potential difference between the gate and source of MOS transistor Q2.
  • a booster circuit having a high step-up efficiency can be obtained by satisfying the condition on the threshold voltage. Further, if condition (d) is satisfied, a booster circuit capable of supplying a high stepped-up voltage can be designed while the reduc­tion of the output voltage due to the threshold voltage of MOS transistors Q and Q2 can be suppressed to a minimum. In the first embodiment, this is achieved by using an intrinsic MOS transistor having a threshold voltage of substantially 0 V as MOS transistor Q1 and using an enhancement type MOS transistor having a posi­tive threshold voltage as MOS transistor Q2.
  • Fig. 3 shows a sub-booster circuit according to a second embodiment of this invention and peripheral cir­cuits thereof. Portions in Fig. 3 which correspond to those in Fig. 1 are denoted by the same reference numerals and the explanations thereof are therefore omitted.
  • Depletion type N-channel MOS transistor Q4 having a gate grounded is connected between the output terminal of selection circuit 14 and node N1 of sub-­booster circuit 12.
  • sub-booster circuit 14 includes NAND gate (or NOR gate) 16 and CMOS inverter 17.
  • Input terminals of NAND gate 16 are connected to receive selection signals SS1 to SSn (which can be replaced by address signals in the case of memory) which are used to select sub-booster circuit 12.
  • an output potential of CMOS inverter 17 is set to a Vcc level (for example, 5 V), and when sub-booster circuit 12 is not selected, the output potential is set to 0 V.
  • Vcc level for example, 5 V
  • MOS capacitor C1 is formed to have the same structure as enhancement type MOS transistor Q2 so as to have threshold voltage V THC of 1 V, for example, MOS transistor Q1 is formed to have threshold voltage V TH1 of 0 V, and MOS transistor Q4 is formed in the same manner as a depletion type so as to have threshold voltage V TH4 of -3 V, for example.
  • a sub-booster circuit which can step up an output voltage of a main booster circuit with a high step-up efficiency can be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Dc-Dc Converters (AREA)
  • Read Only Memory (AREA)
  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Semiconductor Memories (AREA)
  • Non-Volatile Memory (AREA)
EP88106492A 1987-04-24 1988-04-22 Zusatz-Boosterschaltung zum Anheben der Ausgangsspannung einer Haupt-Boosterspannung Expired - Lifetime EP0288075B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP101419/87 1987-04-24
JP10141987A JPH0748310B2 (ja) 1987-04-24 1987-04-24 半導体集積回路

Publications (3)

Publication Number Publication Date
EP0288075A2 true EP0288075A2 (de) 1988-10-26
EP0288075A3 EP0288075A3 (en) 1990-10-17
EP0288075B1 EP0288075B1 (de) 1995-02-15

Family

ID=14300189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106492A Expired - Lifetime EP0288075B1 (de) 1987-04-24 1988-04-22 Zusatz-Boosterschaltung zum Anheben der Ausgangsspannung einer Haupt-Boosterspannung

Country Status (5)

Country Link
US (1) US4905314A (de)
EP (1) EP0288075B1 (de)
JP (1) JPH0748310B2 (de)
KR (1) KR910003387B1 (de)
DE (1) DE3853016T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0640985A3 (de) * 1993-08-23 1996-07-10 Advanced Micro Devices Inc Verteilte negative Torstromversorgung.
US5633134A (en) * 1992-10-06 1997-05-27 Ig Laboratories, Inc. Method for simultaneously detecting multiple mutations in a DNA sample

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3059737B2 (ja) * 1989-12-25 2000-07-04 シャープ株式会社 半導体記憶装置
EP0954102A1 (de) * 1991-12-09 1999-11-03 Fujitsu Limited Exklusiv-NOR-Gatter
US5255224A (en) * 1991-12-18 1993-10-19 International Business Machines Corporation Boosted drive system for master/local word line memory architecture
KR940008206B1 (ko) * 1991-12-28 1994-09-08 삼성전자 주식회사 고전압 스위치 회로
KR960012789B1 (ko) * 1993-12-01 1996-09-24 현대전자산업 주식회사 부트스트랩 회로
KR100307514B1 (ko) * 1994-07-30 2001-12-01 김영환 차지펌프회로
JP3378457B2 (ja) * 1997-02-26 2003-02-17 株式会社東芝 半導体装置
JP2001160295A (ja) * 1999-12-01 2001-06-12 Toshiba Corp 半導体集積回路
US6788578B1 (en) 2003-01-27 2004-09-07 Turbo Ic, Inc. Charge pump for conductive lines in programmable memory array

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5693422A (en) * 1979-12-05 1981-07-29 Fujitsu Ltd Level-up circuit
JPS56129570A (en) * 1980-03-14 1981-10-09 Mitsubishi Electric Corp Booster circuit
US4725746A (en) * 1981-10-20 1988-02-16 Kabushiki Kaisha Toshiba MOSFET buffer circuit with an improved bootstrapping circuit
US4511811A (en) * 1982-02-08 1985-04-16 Seeq Technology, Inc. Charge pump for providing programming voltage to the word lines in a semiconductor memory array
JPS58184821A (ja) * 1982-03-31 1983-10-28 Fujitsu Ltd 昇圧回路
JPS59124095A (ja) * 1982-12-29 1984-07-18 Fujitsu Ltd 半導体記憶装置
US4716303A (en) * 1985-05-01 1987-12-29 Sharp Kabushiki Kaisha MOS IC pull-up circuit
JPS61260717A (ja) * 1985-05-14 1986-11-18 Mitsubishi Electric Corp 半導体昇圧信号発生回路
US4689495A (en) * 1985-06-17 1987-08-25 Advanced Micro Devices, Inc. CMOS high voltage switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5633134A (en) * 1992-10-06 1997-05-27 Ig Laboratories, Inc. Method for simultaneously detecting multiple mutations in a DNA sample
EP0640985A3 (de) * 1993-08-23 1996-07-10 Advanced Micro Devices Inc Verteilte negative Torstromversorgung.

Also Published As

Publication number Publication date
US4905314A (en) 1990-02-27
DE3853016D1 (de) 1995-03-23
JPS63268196A (ja) 1988-11-04
EP0288075B1 (de) 1995-02-15
EP0288075A3 (en) 1990-10-17
DE3853016T2 (de) 1995-07-20
JPH0748310B2 (ja) 1995-05-24
KR910003387B1 (ko) 1991-05-28
KR880013173A (ko) 1988-11-30

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